Fix dependency issue

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@5215 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/rdoc/generators/ri_generator.rb b/lib/rdoc/generators/ri_generator.rb
index c2b5269c3..4e842d09e 100644
--- a/lib/rdoc/generators/ri_generator.rb
+++ b/lib/rdoc/generators/ri_generator.rb
@@ -236,7 +236,13 @@ module Generators
         namespace = rdr.top_level_namespace
         namespace = rdr.lookup_namespace_in(cls_desc.name, namespace)
         if namespace.empty?
-          raise RiError.new("Nothing known about #{arg}")
+          $stderr.puts "You asked me to merge this source into existing "
+          $stderr.puts "documentation. This file references a class or "
+          $stderr.puts "module called #{cls_desc.name} which I don't"
+          $stderr.puts "have existing documentation for."
+          $stderr.puts 
+          $stderr.puts "Perhaps you need to generate its documentation first"
+          exit 1
         else
           old_cls = namespace[0]
         end